Java package java.util.Optional was introduced in Java 8 to address issues related to null values. While its intent was to reduce NullPointerException and make code safer, its design and ...
Optionalから値を取り出さずに処理したい場合にifPresentメソッドを使用する。このメソッドはConsumer型のラムダ式を受け取り、Optionalが値を持っていれば引数に渡してラムダ式を実行する。
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